I saw a show once that left an impression on me,....I thought it was Outer Limits, but it might've been a twilight Zone...or another.....

The aliens had a crumpled skin looking like small brain pattern, or like a clay....and it turns out that they came to the Earth to save mankind from a disease that was coming to Earth, and the only way we could be saved was to touch them and hold hands, and get the horrible looking skin that they had....the whole premise they laid out had to be believed by trust, since the whole disease wasn't detected yet, and one by one humans held their hands and got their particular disfiguring looks .....